问题
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1,5,9,14,21,() A、30;B. 32;C. 34;D. 36;
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0,1/3, 5/8,5/6,9/10,()A.5/6 B.8/9 C.13/14 D.21/20
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0,1/3,5/8,5/6,9/10,()A.5/6 B.8/9 C.13/14 D.21/20
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0,1/3,5/8,5/6,9/10,()A.5/6B.8/9C.13/14D.21/20
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:1,3,3,5,7,9,13,15,(),()。A.19,21 B.19,23 C.21,23 D.27,30
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0,1/3,5/8,5/6,9/10,() A.5/6 B.8/9 C.13/14 D.21/20